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package challenge05;

import static org.junit.Assert.assertTrue;

import java.util.regex.Pattern;

import org.junit.jupiter.api.Test;

/**

* The Class Challenge05.

*

* 5) How to check if a String contains only digits? (solution) You need to

* write a program to check a String contains only numbers by using Regular

* expression in Java. You can use Java API but a solution without using Java

* API will be better

*/

public class Challenge05 {

public static boolean isDigitsOnly(String input) {

return Pattern.matches("[0-9]*",input);

}

@Test

public void test() {

assertTrue(!Challenge05.isDigitsOnly("olleH"));

assertTrue(Challenge05.isDigitsOnly("986"));

}

}